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</pre><pre class="rust ">
<span class="comment">// async_client.rs</span>
<span class="comment">// This file is part of the Eclipse Paho MQTT Rust Client library.</span>
<span class="comment">//</span>

<span class="comment">/*******************************************************************************
 * Copyright (c) 2017 Frank Pagliughi &lt;fpagliughi@mindspring.com&gt;
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v1.0 which accompany this distribution.
 *
 * The Eclipse Public License is available at
 *    http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 *   http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *    Frank Pagliughi - initial implementation and documentation
 *******************************************************************************/</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>;
<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">ptr</span>, <span class="ident">slice</span>};	<span class="comment">// mem</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::{<span class="ident">Arc</span>, <span class="ident">Mutex</span>, <span class="ident">Condvar</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ffi</span>::{<span class="ident">CString</span>, <span class="ident">CStr</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">raw</span>::{<span class="ident">c_void</span>, <span class="ident">c_char</span>, <span class="ident">c_int</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">mpsc</span>::{<span class="ident">Sender</span>, <span class="ident">Receiver</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">mpsc</span>;

<span class="kw">use</span> <span class="ident">ffi</span>;

<span class="kw">use</span> <span class="ident">create_options</span>::{<span class="ident">CreateOptions</span>,<span class="ident">PersistenceType</span>};
<span class="kw">use</span> <span class="ident">connect_options</span>::<span class="ident">ConnectOptions</span>;
<span class="kw">use</span> <span class="ident">disconnect_options</span>::{<span class="ident">DisconnectOptions</span>,<span class="ident">DisconnectOptionsBuilder</span>};
<span class="kw">use</span> <span class="ident">message</span>::<span class="ident">Message</span>;
<span class="kw">use</span> <span class="ident">client_persistence</span>::{<span class="comment">/*ClientPersistence,*/</span> <span class="ident">ClientPersistenceBridge</span>};
<span class="kw">use</span> <span class="ident">errors</span>::{<span class="ident">MqttResult</span>, <span class="comment">/*MqttError,*/</span> <span class="ident">ErrorKind</span>};
<span class="kw">use</span> <span class="ident">string_collection</span>::{<span class="ident">StringCollection</span>};

<span class="comment">/////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// Token</span>

<span class="comment">// Callback for the token on successful completion</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">SuccessCallback</span> <span class="op">=</span> <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>, <span class="ident">u16</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>;

<span class="comment">// Callback for the token on failed completion</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">FailureCallback</span> <span class="op">=</span> <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>, <span class="ident">u16</span>, <span class="ident">i32</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>;

<span class="doccomment">/// The result data for the token.</span>
<span class="doccomment">/// This is the guarded elements in the token which are updated by the</span>
<span class="doccomment">/// C library callback when the operation completes.</span>
<span class="kw">struct</span> <span class="ident">TokenData</span> {
	<span class="doccomment">/// Whether the async action has completed</span>
	<span class="ident">complete</span>: <span class="ident">bool</span>,
	<span class="doccomment">/// The MQTT Message ID</span>
	<span class="ident">msg_id</span>: <span class="ident">i16</span>,
	<span class="doccomment">/// The return/error code for the action (zero is success)</span>
	<span class="ident">ret_code</span>: <span class="ident">i32</span>,
	<span class="doccomment">/// The error message (if any)</span>
	<span class="ident">err_msg</span>: <span class="ident">String</span>,
}


<span class="doccomment">/// A `Token` is a mechanism for tracking the progress of an asynchronous</span>
<span class="doccomment">/// operation.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Token</span> {
	<span class="comment">// Mutex guards: (done, ret, msgid)</span>
	<span class="ident">lock</span>: <span class="ident">Mutex</span><span class="op">&lt;</span><span class="ident">TokenData</span><span class="op">&gt;</span>,
	<span class="comment">// Signal for when the state changes</span>
	<span class="ident">cv</span>: <span class="ident">Condvar</span>,
	<span class="comment">// Pointer to the client that created the token.</span>
	<span class="comment">// This is only guaranteed valid until the end of the callback</span>
	<span class="ident">cli</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">AsyncClient</span>,
	<span class="comment">// User callback for successful completion of the async action</span>
	<span class="ident">on_success</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">SuccessCallback</span><span class="op">&gt;&gt;</span>,
	<span class="comment">// User callback for failed completion of the async action</span>
	<span class="ident">on_failure</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">FailureCallback</span><span class="op">&gt;&gt;</span>,
	<span class="comment">// The message (valid only for &quot;delivery&quot; tokens)</span>
	<span class="ident">msg</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Message</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="ident">Token</span> {
	<span class="doccomment">/// Creates a new, unsignaled Token.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">Token</span> {
		<span class="ident">Token</span> {
			<span class="ident">lock</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">TokenData</span> {
				<span class="ident">complete</span>: <span class="bool-val">false</span>,
				<span class="ident">msg_id</span>: <span class="number">0</span>,
				<span class="ident">ret_code</span>: <span class="number">0</span>,
				<span class="ident">err_msg</span>: <span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>(),
			}),
			<span class="ident">cv</span>: <span class="ident">Condvar</span>::<span class="ident">new</span>(),
			<span class="ident">cli</span>: <span class="ident">ptr</span>::<span class="ident">null</span>(),
			<span class="ident">on_success</span>: <span class="prelude-val">None</span>,
			<span class="ident">on_failure</span>: <span class="prelude-val">None</span>,
			<span class="ident">msg</span>: <span class="prelude-val">None</span>
		}
	}

	<span class="doccomment">/// Creates a new, unsignalled delivery Token.</span>
	<span class="doccomment">/// This ia a token which tracks delivery of a message.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_message</span>(<span class="ident">msg</span>: <span class="ident">Message</span>) <span class="op">-&gt;</span> <span class="ident">Token</span> {
		<span class="ident">Token</span> {
			<span class="ident">lock</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">TokenData</span> {
				<span class="ident">complete</span>: <span class="bool-val">false</span>,
				<span class="ident">msg_id</span>: <span class="ident">msg</span>.<span class="ident">cmsg</span>.<span class="ident">msgid</span> <span class="kw">as</span> <span class="ident">i16</span>,
				<span class="ident">ret_code</span>: <span class="number">0</span>,
				<span class="ident">err_msg</span>: <span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>(),
			}),
			<span class="ident">cv</span>: <span class="ident">Condvar</span>::<span class="ident">new</span>(),
			<span class="ident">cli</span>: <span class="ident">ptr</span>::<span class="ident">null</span>(),
			<span class="ident">on_success</span>: <span class="prelude-val">None</span>,
			<span class="ident">on_failure</span>: <span class="prelude-val">None</span>,
			<span class="ident">msg</span>: <span class="prelude-val">Some</span>(<span class="ident">msg</span>),
		}
	}

	<span class="doccomment">/// Creates a new, unsignalled Token with callbacks.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_client</span><span class="op">&lt;</span><span class="ident">FS</span>,<span class="ident">FF</span><span class="op">&gt;</span>(<span class="ident">cli</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">AsyncClient</span>,
							  <span class="ident">success_cb</span>: <span class="ident">FS</span>,
							  <span class="ident">failure_cb</span>: <span class="ident">FF</span>) <span class="op">-&gt;</span> <span class="ident">Token</span>
		<span class="kw">where</span> <span class="ident">FS</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>, <span class="ident">u16</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>,
			  <span class="ident">FF</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>, <span class="ident">u16</span>,<span class="ident">i32</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>
	{
		<span class="ident">Token</span> {
			<span class="ident">lock</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">TokenData</span> {
				<span class="ident">complete</span>: <span class="bool-val">false</span>,
				<span class="ident">msg_id</span>: <span class="number">0</span>,
				<span class="ident">ret_code</span>: <span class="number">0</span>,
				<span class="ident">err_msg</span>: <span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>(),
			}),
			<span class="ident">cv</span>: <span class="ident">Condvar</span>::<span class="ident">new</span>(),
			<span class="ident">cli</span>: <span class="ident">cli</span>,
			<span class="ident">on_success</span>: <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">success_cb</span>)),
			<span class="ident">on_failure</span>: <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">failure_cb</span>)),
			<span class="ident">msg</span>: <span class="prelude-val">None</span>
		}
	}

	<span class="doccomment">/// Creates a new Token signalled with an error.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_error</span>(<span class="ident">rc</span>: <span class="ident">i32</span>) <span class="op">-&gt;</span> <span class="ident">Token</span> {
		<span class="ident">Token</span> {
			<span class="ident">lock</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">TokenData</span> {
				<span class="ident">complete</span>: <span class="bool-val">true</span>,
				<span class="ident">msg_id</span>: <span class="number">0</span>,
				<span class="ident">ret_code</span>: <span class="ident">rc</span>,
				<span class="ident">err_msg</span>: <span class="ident">String</span>::<span class="ident">from</span>(<span class="ident">Token</span>::<span class="ident">error_msg</span>(<span class="ident">rc</span>)),
			}),
			<span class="ident">cv</span>: <span class="ident">Condvar</span>::<span class="ident">new</span>(),
			<span class="ident">cli</span>: <span class="ident">ptr</span>::<span class="ident">null</span>(),
			<span class="ident">on_success</span>: <span class="prelude-val">None</span>,
			<span class="ident">on_failure</span>: <span class="prelude-val">None</span>,
			<span class="ident">msg</span>: <span class="prelude-val">None</span>
		}
	}



	<span class="comment">// Callback from the C library for when an async operation succeeds.</span>
	<span class="kw">unsafe</span> <span class="kw">extern</span> <span class="string">&quot;C&quot;</span> <span class="kw">fn</span> <span class="ident">on_success</span>(<span class="ident">context</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>, <span class="ident">rsp</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_successData</span>) {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Token success! {:?}, {:?}&quot;</span>, <span class="ident">context</span>, <span class="ident">rsp</span>);
		<span class="kw">if</span> <span class="ident">context</span>.<span class="ident">is_null</span>() {
			<span class="kw">return</span>
		}
		<span class="kw">let</span> <span class="ident">msgid</span> <span class="op">=</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">rsp</span>.<span class="ident">is_null</span>() { (<span class="kw-2">*</span><span class="ident">rsp</span>).<span class="ident">token</span> <span class="kw">as</span> <span class="ident">u16</span> } <span class="kw">else</span> { <span class="number">0</span> };
		<span class="kw">let</span> <span class="ident">tokptr</span> <span class="op">=</span> <span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>;
		<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">tokptr</span>;
		<span class="ident">tok</span>.<span class="ident">on_complete</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">tok</span>.<span class="ident">cli</span>, <span class="ident">msgid</span>, <span class="number">0</span>, <span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>());
		<span class="kw">let</span> _ <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">tokptr</span>);
	}

	<span class="comment">// Callback from the C library when an async operation fails.</span>
	<span class="kw">unsafe</span> <span class="kw">extern</span> <span class="string">&quot;C&quot;</span> <span class="kw">fn</span> <span class="ident">on_failure</span>(<span class="ident">context</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>, <span class="ident">rsp</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_failureData</span>) {
		<span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;Token failure! {:?}, {:?}&quot;</span>, <span class="ident">context</span>, <span class="ident">rsp</span>);
		<span class="kw">if</span> <span class="ident">context</span>.<span class="ident">is_null</span>() {
			<span class="kw">return</span>
		}
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">msgid</span> <span class="op">=</span> <span class="number">0</span>;
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rc</span> <span class="op">=</span> <span class="op">-</span><span class="number">1</span>;
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">msg</span> <span class="op">=</span> <span class="string">&quot;Error&quot;</span>.<span class="ident">to_string</span>();

		<span class="kw">if</span> <span class="op">!</span><span class="ident">rsp</span>.<span class="ident">is_null</span>() {
			<span class="ident">msgid</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">rsp</span>).<span class="ident">token</span> <span class="kw">as</span> <span class="ident">u16</span>;
			<span class="ident">rc</span> <span class="op">=</span> <span class="kw">if</span> (<span class="kw-2">*</span><span class="ident">rsp</span>).<span class="ident">code</span> <span class="op">==</span> <span class="number">0</span> { <span class="op">-</span><span class="number">1i32</span> } <span class="kw">else</span> { (<span class="kw-2">*</span><span class="ident">rsp</span>).<span class="ident">code</span> <span class="kw">as</span> <span class="ident">i32</span> };

			<span class="kw">if</span> <span class="op">!</span>(<span class="kw-2">*</span><span class="ident">rsp</span>).<span class="ident">message</span>.<span class="ident">is_null</span>() {
				<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">cmsg</span>) <span class="op">=</span> <span class="ident">CStr</span>::<span class="ident">from_ptr</span>((<span class="kw-2">*</span><span class="ident">rsp</span>).<span class="ident">message</span>).<span class="ident">to_str</span>() {
					<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Token failure message: {:?}&quot;</span>, <span class="ident">cmsg</span>);
					<span class="ident">msg</span> <span class="op">=</span> <span class="ident">cmsg</span>.<span class="ident">to_string</span>();
				}
			}
		}

		<span class="kw">if</span> <span class="ident">msg</span>.<span class="ident">is_empty</span>() {
			<span class="kw">let</span> <span class="ident">emsg</span> <span class="op">=</span> <span class="ident">Token</span>::<span class="ident">error_msg</span>(<span class="ident">rc</span>);
			<span class="ident">msg</span> <span class="op">=</span> <span class="ident">emsg</span>.<span class="ident">to_string</span>();
		}

		<span class="kw">let</span> <span class="ident">tokptr</span> <span class="op">=</span> <span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>;
		<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">tokptr</span>;
		<span class="comment">// TODO: Check client null?</span>
		<span class="ident">tok</span>.<span class="ident">on_complete</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">tok</span>.<span class="ident">cli</span>, <span class="ident">msgid</span>, <span class="ident">rc</span>, <span class="ident">msg</span>);
		<span class="kw">let</span> _ <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">tokptr</span>);
	}

	<span class="comment">// Callback function to update the token when the action completes.</span>
	<span class="kw">fn</span> <span class="ident">on_complete</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cli</span>: <span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>, <span class="ident">msgid</span>: <span class="ident">u16</span>, <span class="ident">rc</span>: <span class="ident">i32</span>, <span class="ident">msg</span>: <span class="ident">String</span>) {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Token completed with code: {}&quot;</span>, <span class="ident">rc</span>);
		{
			<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">retv</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
			(<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">complete</span> <span class="op">=</span> <span class="bool-val">true</span>;
			(<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">ret_code</span> <span class="op">=</span> <span class="ident">rc</span>;
			(<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">err_msg</span> <span class="op">=</span> <span class="ident">msg</span>;
		}
		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">==</span> <span class="number">0</span> {
			<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">cb</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">on_success</span> {
				<span class="macro">trace</span><span class="macro">!</span>(<span class="string">&quot;Invoking Token::on_success callback&quot;</span>);
				<span class="ident">cb</span>(<span class="ident">cli</span>, <span class="ident">msgid</span>);
			}
		}
		<span class="kw">else</span> {
			<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">cb</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">on_failure</span> {
				<span class="macro">trace</span><span class="macro">!</span>(<span class="string">&quot;Invoking Token::on_failure callback&quot;</span>);
				<span class="ident">cb</span>(<span class="ident">cli</span>, <span class="ident">msgid</span>, <span class="ident">rc</span>);
			}
		}
		<span class="self">self</span>.<span class="ident">cv</span>.<span class="ident">notify_all</span>();
	}

	<span class="comment">// Gets the string associated with the error code from the C lib.</span>
	<span class="kw">fn</span> <span class="ident">error_msg</span>(<span class="ident">rc</span>: <span class="ident">i32</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span> {
		<span class="kw">match</span> <span class="ident">rc</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_FAILURE</span> <span class="op">=&gt;</span> <span class="string">&quot;General failure&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_PERSISTENCE_ERROR</span> <span class="comment">/* -2 */</span> <span class="op">=&gt;</span> <span class="string">&quot;Persistence error&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_DISCONNECTED</span> <span class="op">=&gt;</span> <span class="string">&quot;Client disconnected&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_MAX_MESSAGES_INFLIGHT</span> <span class="op">=&gt;</span> <span class="string">&quot;Maximum inflight messages&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_BAD_UTF8_STRING</span> <span class="op">=&gt;</span> <span class="string">&quot;Bad UTF8 string&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_NULL_PARAMETER</span> <span class="op">=&gt;</span> <span class="string">&quot;NULL Parameter&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_TOPICNAME_TRUNCATED</span> <span class="op">=&gt;</span> <span class="string">&quot;Topic name truncated&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_BAD_STRUCTURE</span> <span class="op">=&gt;</span> <span class="string">&quot;Bad structure&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_BAD_QOS</span> <span class="op">=&gt;</span> <span class="string">&quot;Bad QoS&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_NO_MORE_MSGIDS</span> <span class="op">=&gt;</span> <span class="string">&quot;No more message ID&#39;s&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_OPERATION_INCOMPLETE</span> <span class="op">=&gt;</span> <span class="string">&quot;Operation incomplete&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_MAX_BUFFERED_MESSAGES</span> <span class="op">=&gt;</span> <span class="string">&quot;Max buffered messages&quot;</span>,
			<span class="ident">ffi</span>::<span class="ident">MQTTASYNC_SSL_NOT_SUPPORTED</span> <span class="op">=&gt;</span> <span class="string">&quot;SSL not supported by Paho C library&quot;</span>,
			 _ <span class="op">=&gt;</span> <span class="string">&quot;&quot;</span>,
		}
	}


	<span class="doccomment">/// Sets the message ID for the token</span>
	<span class="kw">fn</span> <span class="ident">set_msgid</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">msg_id</span>: <span class="ident">i16</span>) {
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">retv</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
		(<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">msg_id</span> <span class="op">=</span> <span class="ident">msg_id</span>;
	}


	<span class="doccomment">/// Blocks the caller until the asynchronous operation has completed.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">MqttResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">retv</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();

		<span class="comment">// As long as the &#39;done&#39; value inside the `Mutex` is false, we wait.</span>
		<span class="kw">while</span> <span class="op">!</span>(<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">complete</span> {
			<span class="ident">retv</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cv</span>.<span class="ident">wait</span>(<span class="ident">retv</span>).<span class="ident">unwrap</span>();
		}

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">ret_code</span>;
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Token completed: {}&quot;</span>, <span class="ident">rc</span>);
		<span class="comment">// TODO: Get real error result &amp; message</span>
		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">err_msg</span>.<span class="ident">clone</span>();
			<span class="macro">fail</span><span class="macro">!</span>((<span class="ident">ErrorKind</span>::<span class="ident">General</span>, <span class="ident">rc</span>, <span class="string">&quot;Error&quot;</span>, <span class="ident">msg</span>));
		}
		<span class="prelude-val">Ok</span>(())
	}

	<span class="doccomment">/// Blocks the caller a limited amount of time waiting for the</span>
	<span class="doccomment">/// asynchronous operation to complete.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait_for</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">dur</span>: <span class="ident">Duration</span>) <span class="op">-&gt;</span> <span class="ident">MqttResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">retv</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();

		<span class="kw">while</span> <span class="op">!</span>(<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">complete</span> {
			<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cv</span>.<span class="ident">wait_timeout</span>(<span class="ident">retv</span>, <span class="ident">dur</span>).<span class="ident">unwrap</span>();

			<span class="kw">if</span> <span class="ident">result</span>.<span class="number">1</span>.<span class="ident">timed_out</span>() {
				<span class="macro">fail</span><span class="macro">!</span>(::<span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(::<span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">TimedOut</span>, <span class="string">&quot;Timed out&quot;</span>));
			}
			<span class="ident">retv</span> <span class="op">=</span> <span class="ident">result</span>.<span class="number">0</span>;
		}

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">ret_code</span>;
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Timed token completed: {}&quot;</span>, <span class="ident">rc</span>);
		<span class="comment">// TODO: Get real error result &amp; message</span>
		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">retv</span>).<span class="ident">err_msg</span>.<span class="ident">clone</span>();
			<span class="macro">fail</span><span class="macro">!</span>((<span class="ident">ErrorKind</span>::<span class="ident">General</span>, <span class="ident">rc</span>, <span class="string">&quot;Error&quot;</span>, <span class="ident">msg</span>));
		}

		<span class="prelude-val">Ok</span>(())
	}
}

<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">DeliveryToken</span> <span class="op">=</span> <span class="ident">Token</span>;

<span class="comment">/////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// AsynClient</span>

<span class="comment">// User callback type for when the connection is lost from the broker.</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">ConnectionLostCallback</span> <span class="op">=</span> <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">AsyncClient</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>;

<span class="comment">// User callback signature for when subscribed messages are received.</span>
<span class="kw">pub</span> <span class="kw">type</span> <span class="ident">MessageArrivedCallback</span> <span class="op">=</span> <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>, <span class="ident">Message</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>;

<span class="comment">// The context provided for the client callbacks.</span>
<span class="comment">// Note that the Paho C library maintains a single void* context pointer</span>
<span class="comment">// shared between all of the callbacks. We could use just a pointer to the</span>
<span class="comment">// client and retrieve the callbacks from there, but that would require</span>
<span class="comment">// every callback to synchronize data access from the callback.</span>
<span class="kw">struct</span> <span class="ident">CallbackContext</span>
{
	<span class="ident">on_connection_lost</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">ConnectionLostCallback</span><span class="op">&gt;&gt;</span>,
	<span class="ident">on_message_arrived</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="ident">MessageArrivedCallback</span><span class="op">&gt;&gt;</span>,
}

<span class="doccomment">/// An asynchronous MQTT connection client.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AsyncClient</span> {
	<span class="comment">// The handle to the Paho C client</span>
	<span class="ident">handle</span>: <span class="ident">ffi</span>::<span class="ident">MQTTAsync</span>,
	<span class="comment">// The options for connecting to the broker</span>
	<span class="ident">opts</span>: <span class="ident">Mutex</span><span class="op">&lt;</span><span class="ident">ConnectOptions</span><span class="op">&gt;</span>,
	<span class="comment">// The context to give to the C callbacks</span>
	<span class="ident">callback_context</span>: <span class="ident">Mutex</span><span class="op">&lt;</span><span class="ident">CallbackContext</span><span class="op">&gt;</span>,
	<span class="comment">// The server URI</span>
	<span class="ident">server_uri</span>: <span class="ident">CString</span>,
	<span class="comment">// The MQTT client ID name</span>
	<span class="ident">client_id</span>: <span class="ident">CString</span>,
	<span class="comment">// Raw pointer to the user persistence (if any)</span>
	<span class="comment">// This is a consumed box, and should be dropped manually  </span>
	<span class="ident">persistence_ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">ffi</span>::<span class="ident">MQTTClient_persistence</span>,
}

<span class="kw">impl</span> <span class="ident">AsyncClient</span> {
	<span class="kw">unsafe</span> <span class="kw">extern</span> <span class="string">&quot;C&quot;</span> <span class="kw">fn</span> <span class="ident">on_connected</span>(<span class="ident">context</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>, <span class="ident">rsp</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_successData</span>) {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Connected! {:?}, {:?}&quot;</span>, <span class="ident">context</span>, <span class="ident">rsp</span>);
	}

	<span class="comment">// Low-level callback for when the connection is lost.</span>
	<span class="kw">unsafe</span> <span class="kw">extern</span> <span class="string">&quot;C&quot;</span> <span class="kw">fn</span> <span class="ident">on_connection_lost</span>(<span class="ident">context</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>,
											<span class="ident">_cause</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_char</span>) {
		<span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;\nConnection lost. Context: {:?}&quot;</span>, <span class="ident">context</span>);
		<span class="kw">if</span> <span class="op">!</span><span class="ident">context</span>.<span class="ident">is_null</span>() {
			<span class="kw">let</span> <span class="ident">cli</span> <span class="op">=</span> <span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">AsyncClient</span>;
			<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cbctx</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">cli</span>).<span class="ident">callback_context</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();

			<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">cb</span>) <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">cbctx</span>).<span class="ident">on_connection_lost</span> {
				<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Invoking connection lost callback&quot;</span>);
				<span class="ident">cb</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">cli</span>);
			}
		}
	}

	<span class="comment">// Low-level callback for when a message arrives from the broker.</span>
	<span class="kw">unsafe</span> <span class="kw">extern</span> <span class="string">&quot;C&quot;</span> <span class="kw">fn</span> <span class="ident">on_message_arrived</span>(<span class="ident">context</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>,
											<span class="ident">topic_name</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_char</span>,
											<span class="ident">topic_len</span>: <span class="ident">c_int</span>,
											<span class="kw-2">mut</span> <span class="ident">cmsg</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_message</span>) <span class="op">-&gt;</span> <span class="ident">c_int</span> {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;\nMessage arrived. Context: {:?}, topic: {:?} len {:?} cmsg: {:?}: {:?}&quot;</span>,
				 <span class="ident">context</span>, <span class="ident">topic_name</span>, <span class="ident">topic_len</span>, <span class="ident">cmsg</span>, <span class="kw-2">*</span><span class="ident">cmsg</span>);

		<span class="kw">if</span> <span class="op">!</span><span class="ident">context</span>.<span class="ident">is_null</span>() {
			<span class="kw">let</span> <span class="ident">cli</span> <span class="op">=</span> <span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">AsyncClient</span>;
			<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cbctx</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">cli</span>).<span class="ident">callback_context</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();

			<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">cb</span>) <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">cbctx</span>).<span class="ident">on_message_arrived</span> {
				<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">topic_len</span> <span class="kw">as</span> <span class="ident">usize</span>;
				<span class="kw">let</span> <span class="ident">tp</span> <span class="op">=</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="ident">topic_name</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>, <span class="ident">len</span>)).<span class="ident">unwrap</span>();
				<span class="kw">let</span> <span class="ident">topic</span> <span class="op">=</span> <span class="ident">CString</span>::<span class="ident">new</span>(<span class="ident">tp</span>).<span class="ident">unwrap</span>();
				<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">Message</span>::<span class="ident">from_c_parts</span>(<span class="ident">topic</span>, <span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">cmsg</span>);

				<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Invoking message callback&quot;</span>);
				<span class="ident">cb</span>(<span class="kw-2">&amp;</span><span class="kw-2">*</span><span class="ident">cli</span>, <span class="ident">msg</span>);
			}
		}

		<span class="ident">ffi</span>::<span class="ident">MQTTAsync_freeMessage</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">cmsg</span>);	<span class="comment">// as *mut *mut ffi::MQTTAsync_message);</span>
		<span class="ident">ffi</span>::<span class="ident">MQTTAsync_free</span>(<span class="ident">topic_name</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>);
		<span class="number">1</span>
	}
	<span class="doccomment">/// Creates a new MQTT client which can connect to an MQTT broker.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// * `server_uri` The address of the MQTT broker.</span>
	<span class="doccomment">/// * `client_id` The unique name of the client. if this is empty, the</span>
	<span class="doccomment">///		the broker will assign a unique name.</span>
	<span class="doccomment">///</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">opts</span>: <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">MqttResult</span><span class="op">&lt;</span><span class="ident">AsyncClient</span><span class="op">&gt;</span> 
		<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">CreateOptions</span><span class="op">&gt;</span>
	{
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">opts</span> <span class="op">=</span> <span class="ident">opts</span>.<span class="ident">into</span>();

		<span class="comment">// TODO: Don&#39;t unwrap() CStrings. Return error instead.</span>

		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cli</span> <span class="op">=</span> <span class="ident">AsyncClient</span> {
			<span class="ident">handle</span>: <span class="ident">ptr</span>::<span class="ident">null_mut</span>(),
			<span class="ident">opts</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">ConnectOptions</span>::<span class="ident">new</span>()),
			<span class="ident">callback_context</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">CallbackContext</span> {
				<span class="ident">on_connection_lost</span>: <span class="prelude-val">None</span>,
				<span class="ident">on_message_arrived</span>: <span class="prelude-val">None</span>,
			}),
			<span class="ident">server_uri</span>: <span class="ident">CString</span>::<span class="ident">new</span>(<span class="ident">opts</span>.<span class="ident">server_uri</span>).<span class="ident">unwrap</span>(),
			<span class="ident">client_id</span>: <span class="ident">CString</span>::<span class="ident">new</span>(<span class="ident">opts</span>.<span class="ident">client_id</span>).<span class="ident">unwrap</span>(),
			<span class="ident">persistence_ptr</span>: <span class="ident">ptr</span>::<span class="ident">null_mut</span>(),
		};

		<span class="kw">let</span> (<span class="ident">ptype</span>, <span class="ident">usrptr</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">opts</span>.<span class="ident">persistence</span> {
			<span class="ident">PersistenceType</span>::<span class="ident">User</span>(<span class="ident">persist</span>) <span class="op">=&gt;</span> (<span class="ident">ffi</span>::<span class="ident">MQTTCLIENT_PERSISTENCE_USER</span>, <span class="ident">Box</span>::<span class="ident">into_raw</span>(<span class="ident">persist</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _),
			<span class="ident">PersistenceType</span>::<span class="ident">File</span> <span class="op">=&gt;</span> (<span class="ident">ffi</span>::<span class="ident">MQTTCLIENT_PERSISTENCE_DEFAULT</span>, <span class="ident">ptr</span>::<span class="ident">null_mut</span>()),
			<span class="ident">PersistenceType</span>::<span class="prelude-val">None</span> <span class="op">=&gt;</span> (<span class="ident">ffi</span>::<span class="ident">MQTTCLIENT_PERSISTENCE_NONE</span>, <span class="ident">ptr</span>::<span class="ident">null_mut</span>()),
		};

		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Creating client with persistence: {}, {:?}&quot;</span>, <span class="ident">ptype</span>, <span class="ident">usrptr</span>);

		<span class="kw">if</span> <span class="op">!</span><span class="ident">usrptr</span>.<span class="ident">is_null</span>() {
			<span class="comment">// TODO: The bridge should return boxed persistence given uptr</span>
			<span class="kw">let</span> <span class="ident">persistence</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">ffi</span>::<span class="ident">MQTTClient_persistence</span> {
				<span class="ident">context</span>: <span class="ident">usrptr</span>,
				<span class="ident">popen</span>: <span class="prelude-val">Some</span>(<span class="ident">ClientPersistenceBridge</span>::<span class="ident">on_open</span>),
				<span class="ident">pclose</span>: <span class="prelude-val">Some</span>(<span class="ident">ClientPersistenceBridge</span>::<span class="ident">on_close</span>),
				<span class="ident">pput</span>: <span class="prelude-val">Some</span>(<span class="ident">ClientPersistenceBridge</span>::<span class="ident">on_put</span>),
				<span class="ident">pget</span>: <span class="prelude-val">Some</span>(<span class="ident">ClientPersistenceBridge</span>::<span class="ident">on_get</span>),
				<span class="ident">premove</span>: <span class="prelude-val">Some</span>(<span class="ident">ClientPersistenceBridge</span>::<span class="ident">on_remove</span>),
				<span class="ident">pkeys</span>: <span class="prelude-val">Some</span>(<span class="ident">ClientPersistenceBridge</span>::<span class="ident">on_keys</span>),
				<span class="ident">pclear</span>: <span class="prelude-val">Some</span>(<span class="ident">ClientPersistenceBridge</span>::<span class="ident">on_clear</span>),
				<span class="ident">pcontainskey</span>: <span class="prelude-val">Some</span>(<span class="ident">ClientPersistenceBridge</span>::<span class="ident">on_contains_key</span>),
			});

			<span class="comment">// Note that the C library does NOT keep a copy of this persistence </span>
			<span class="comment">// store structure. We must keep a copy alive for as long as the </span>
			<span class="comment">// client remains active.</span>
			<span class="ident">cli</span>.<span class="ident">persistence_ptr</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">into_raw</span>(<span class="ident">persistence</span>);
		}

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_createWithOptions</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">cli</span>.<span class="ident">handle</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>,
											 <span class="ident">cli</span>.<span class="ident">server_uri</span>.<span class="ident">as_ptr</span>(),
											 <span class="ident">cli</span>.<span class="ident">client_id</span>.<span class="ident">as_ptr</span>(),
											 <span class="ident">ptype</span> <span class="kw">as</span> <span class="ident">c_int</span>, 
											 <span class="ident">cli</span>.<span class="ident">persistence_ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>,
											 <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">opts</span>.<span class="ident">copts</span>) <span class="kw">as</span> <span class="ident">i32</span>
		};

		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;Create result: {}&quot;</span>, <span class="ident">rc</span>); 
			<span class="macro">fail</span><span class="macro">!</span>((<span class="ident">ErrorKind</span>::<span class="ident">General</span>, <span class="ident">rc</span>, <span class="ident">Token</span>::<span class="ident">error_msg</span>(<span class="ident">rc</span>)));
		}
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;AsyncClient handle: {:?}&quot;</span>, <span class="ident">cli</span>.<span class="ident">handle</span>);
		<span class="prelude-val">Ok</span>(<span class="ident">cli</span>)
	}

	<span class="doccomment">/// Connects to an MQTT broker using the specified connect options.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// * `opts` The connect options</span>
	<span class="doccomment">///</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">connect</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">opt_opts</span>: <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span> 
		<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">ConnectOptions</span><span class="op">&gt;&gt;</span>
	{
		<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">opts</span>) <span class="op">=</span> <span class="ident">opt_opts</span>.<span class="ident">into</span>() {
			<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Connecting handle: {:?}&quot;</span>, <span class="self">self</span>.<span class="ident">handle</span>);
			<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Connect options: {:?}&quot;</span>, <span class="ident">opts</span>);

			<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">new</span>());
			<span class="kw">let</span> <span class="ident">tokcb</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">clone</span>();

			<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lkopts</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
			<span class="kw-2">*</span><span class="ident">lkopts</span> <span class="op">=</span> <span class="ident">opts</span>;
			(<span class="kw-2">*</span><span class="ident">lkopts</span>).<span class="ident">copts</span>.<span class="ident">onSuccess</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_success</span>);
			(<span class="kw-2">*</span><span class="ident">lkopts</span>).<span class="ident">copts</span>.<span class="ident">onFailure</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_failure</span>);
			(<span class="kw-2">*</span><span class="ident">lkopts</span>).<span class="ident">copts</span>.<span class="ident">context</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">into_raw</span>(<span class="ident">tokcb</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

			<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
				<span class="ident">ffi</span>::<span class="ident">MQTTAsync_connect</span>(<span class="self">self</span>.<span class="ident">handle</span>, <span class="kw-2">&amp;</span>(<span class="kw-2">*</span><span class="ident">lkopts</span>).<span class="ident">copts</span>)
			};

			<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
				<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Arc</span>::<span class="ident">from_raw</span>((<span class="kw-2">*</span><span class="ident">lkopts</span>).<span class="ident">copts</span>.<span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>) };
				<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">from_error</span>(<span class="ident">rc</span>))
			}
			<span class="kw">else</span> { <span class="ident">tok</span> }
		}
		<span class="kw">else</span> {
			<span class="self">self</span>.<span class="ident">connect</span>(<span class="prelude-val">Some</span>(<span class="ident">ConnectOptions</span>::<span class="ident">default</span>()))
		}
	}


	<span class="doccomment">/// Connects to an MQTT broker using the specified connect options.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// * `opts` The connect options</span>
	<span class="doccomment">///</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">connect_with_callbacks</span><span class="op">&lt;</span><span class="ident">FS</span>,<span class="ident">FF</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>,
										 <span class="kw-2">mut</span> <span class="ident">opts</span>: <span class="ident">ConnectOptions</span>,
										 <span class="ident">success_cb</span>: <span class="ident">FS</span>,
										 <span class="ident">failure_cb</span>: <span class="ident">FF</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span>
		<span class="kw">where</span> <span class="ident">FS</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>,<span class="ident">u16</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>,
			  <span class="ident">FF</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>,<span class="ident">u16</span>,<span class="ident">i32</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>
	{
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Connecting handle: {:?}&quot;</span>, <span class="self">self</span>.<span class="ident">handle</span>);
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;\nConnect opts: {:?}&quot;</span>, <span class="ident">opts</span>);
		<span class="kw">unsafe</span> {
			<span class="kw">if</span> <span class="op">!</span><span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">will</span>.<span class="ident">is_null</span>() {
				<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;\nWill: {:?}&quot;</span>, <span class="kw-2">*</span>(<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">will</span>));
			}
		}

		<span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">Token</span>::<span class="ident">from_client</span>(<span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _, <span class="ident">success_cb</span>, <span class="ident">failure_cb</span>);
		<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">t</span>);
		<span class="kw">let</span> <span class="ident">tokcb</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">clone</span>();

		<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">onSuccess</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_success</span>);
		<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">onFailure</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_failure</span>);
		<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">context</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">into_raw</span>(<span class="ident">tokcb</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;;
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;\nConnect opts: {:?}&quot;</span>, <span class="ident">opts</span>);
		{
			<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lkopts</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
			<span class="kw-2">*</span><span class="ident">lkopts</span> <span class="op">=</span> <span class="ident">opts</span>.<span class="ident">clone</span>();
		}

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_connect</span>(<span class="self">self</span>.<span class="ident">handle</span>, <span class="kw-2">&amp;</span><span class="ident">opts</span>.<span class="ident">copts</span>)
		};

		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>) };
			<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">from_error</span>(<span class="ident">rc</span>))
		}
		<span class="kw">else</span> { <span class="ident">tok</span> }
	}

	<span class="doccomment">/// Attempts to reconnect to the broker.</span>
	<span class="doccomment">/// This can only be called after a connection was initially made or</span>
	<span class="doccomment">/// attempted. It will retry with the same connect options.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reconnect</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span> {
		<span class="kw">let</span> <span class="ident">connopts</span> <span class="op">=</span> {
			<span class="kw">let</span> <span class="ident">lkopts</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
			(<span class="kw-2">*</span><span class="ident">lkopts</span>).<span class="ident">clone</span>()
		};
		<span class="self">self</span>.<span class="ident">connect</span>(<span class="ident">connopts</span>)
	}

	<span class="doccomment">/// Attempts to reconnect to the broker, using callbacks to signal</span>
	<span class="doccomment">/// completion.</span>
	<span class="doccomment">/// This can only be called after a connection was initially made or</span>
	<span class="doccomment">/// attempted. It will retry with the same connect options.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// * `success_cb` The callback for a successful connection.</span>
	<span class="doccomment">/// * `failure_cb` The callback for a failed connection attempt.</span>
	<span class="doccomment">///</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reconnect_with_callbacks</span><span class="op">&lt;</span><span class="ident">FS</span>,<span class="ident">FF</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>,
										   <span class="ident">success_cb</span>: <span class="ident">FS</span>,
										   <span class="ident">failure_cb</span>: <span class="ident">FF</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span>
		<span class="kw">where</span> <span class="ident">FS</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>,<span class="ident">u16</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>,
			  <span class="ident">FF</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>,<span class="ident">u16</span>,<span class="ident">i32</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>
	{
		<span class="kw">let</span> <span class="ident">connopts</span> <span class="op">=</span> {
			<span class="kw">let</span> <span class="ident">lkopts</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">opts</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
			(<span class="kw-2">*</span><span class="ident">lkopts</span>).<span class="ident">clone</span>()
		};
		<span class="self">self</span>.<span class="ident">connect_with_callbacks</span>(<span class="ident">connopts</span>, <span class="ident">success_cb</span>, <span class="ident">failure_cb</span>)
	}

	<span class="doccomment">/// Disconnects from the MQTT broker.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `opt_opts` Optional disconnect options. Specifying `None` will use</span>
	<span class="doccomment">/// 		   default of immediate (zero timeout) disconnect.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">disconnect</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">opt_opts</span>: <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span>
			<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">DisconnectOptions</span><span class="op">&gt;&gt;</span>
	{
		<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">opts</span>) <span class="op">=</span> <span class="ident">opt_opts</span>.<span class="ident">into</span>() {
			<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Disconnecting&quot;</span>);

			<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">new</span>());
			<span class="kw">let</span> <span class="ident">tokcb</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">clone</span>();

			<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">onSuccess</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_success</span>);
			<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">onFailure</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_failure</span>);
			<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">context</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">into_raw</span>(<span class="ident">tokcb</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

			<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
				<span class="ident">ffi</span>::<span class="ident">MQTTAsync_disconnect</span>(<span class="self">self</span>.<span class="ident">handle</span>, <span class="kw-2">&amp;</span><span class="ident">opts</span>.<span class="ident">copts</span>)
			};

			<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
				<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">opts</span>.<span class="ident">copts</span>.<span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>) };
				<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">from_error</span>(<span class="ident">rc</span>))
			}
			<span class="kw">else</span> { <span class="ident">tok</span> }
		}
		<span class="kw">else</span> {
			<span class="self">self</span>.<span class="ident">disconnect</span>(<span class="prelude-val">Some</span>(<span class="ident">DisconnectOptions</span>::<span class="ident">default</span>()))
		}
	}

	<span class="doccomment">/// Disconnect from the MQTT broker with a timeout.</span>
	<span class="doccomment">/// This will delay the disconnect for up to the specified timeout to</span>
	<span class="doccomment">/// allow in-flight messages to complete.</span>
	<span class="doccomment">/// This is the same as calling disconnect with options specifying a</span>
	<span class="doccomment">/// timeout.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `timeout` The amount of time to wait for the disconnect. This has</span>
	<span class="doccomment">/// 		  a resolution in milliseconds.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">disconnect_after</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">timeout</span>: <span class="ident">Duration</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span> {
		<span class="kw">let</span> <span class="ident">disconn_opts</span> <span class="op">=</span> <span class="ident">DisconnectOptionsBuilder</span>::<span class="ident">new</span>()
								.<span class="ident">timeout</span>(<span class="ident">timeout</span>).<span class="ident">finalize</span>();
		<span class="self">self</span>.<span class="ident">disconnect</span>(<span class="ident">disconn_opts</span>)
	}

	<span class="doccomment">/// Determines if this client is currently connected to an MQTT broker.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_connected</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
		<span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_isConnected</span>(<span class="self">self</span>.<span class="ident">handle</span>) <span class="op">!=</span> <span class="number">0</span>
		}
	}

	<span class="doccomment">/// Sets the callback for when the connection is lost with the broker.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// * `cb` The callback to register with the library. This can be a</span>
	<span class="doccomment">/// 	function or a closure.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_connection_lost_callback</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cb</span>: <span class="ident">F</span>)
		<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">AsyncClient</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>
	{
		<span class="comment">// A pointer to self will serve as the callback context</span>
		<span class="kw">let</span> <span class="ident">self_ptr</span> <span class="op">=</span> <span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _ <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

		<span class="comment">// This should be protected by a mutex if we&#39;ll have a thread-safe client</span>
		{
			<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cbctx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">callback_context</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
			(<span class="kw-2">*</span><span class="ident">cbctx</span>).<span class="ident">on_connection_lost</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">cb</span>));
		}

		<span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_setCallbacks</span>(<span class="self">self</span>.<span class="ident">handle</span>,
										<span class="ident">self_ptr</span>,
										<span class="prelude-val">Some</span>(<span class="ident">AsyncClient</span>::<span class="ident">on_connection_lost</span>),
										<span class="prelude-val">Some</span>(<span class="ident">AsyncClient</span>::<span class="ident">on_message_arrived</span>),
										<span class="prelude-val">None</span> <span class="comment">/* Delivery Complete (unused, Tokens track this) */</span>);
		}
	}

	<span class="doccomment">/// Sets the callback for when a message arrives from the broker.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// * `cb` The callback to register with the library. This can be a</span>
	<span class="doccomment">/// 	function or a closure.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_message_callback</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cb</span>: <span class="ident">F</span>)
		<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">AsyncClient</span>,<span class="ident">Message</span>) <span class="op">+</span> <span class="lifetime">&#39;static</span>
	{
		<span class="comment">// A pointer to self will serve as the callback context</span>
		<span class="kw">let</span> <span class="ident">self_ptr</span> <span class="op">=</span> <span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _ <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

		<span class="comment">// This should be protected by a mutex if we&#39;ll have a thread-safe client</span>
		{
			<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cbctx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">callback_context</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
			(<span class="kw-2">*</span><span class="ident">cbctx</span>).<span class="ident">on_message_arrived</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">cb</span>));
		}

		<span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_setCallbacks</span>(<span class="self">self</span>.<span class="ident">handle</span>,
										<span class="ident">self_ptr</span>,
										<span class="prelude-val">Some</span>(<span class="ident">AsyncClient</span>::<span class="ident">on_connection_lost</span>),
										<span class="prelude-val">Some</span>(<span class="ident">AsyncClient</span>::<span class="ident">on_message_arrived</span>),
										<span class="prelude-val">None</span> <span class="comment">/* Delivery Complete (unused, Tokens track this) */</span>);
		}
	}

	<span class="doccomment">/// Publishes a message to an MQTT broker</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// * `msg` The message to publish.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">publish</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">msg</span>: <span class="ident">Message</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">DeliveryToken</span><span class="op">&gt;</span> {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Publish: {:?}&quot;</span>, <span class="ident">msg</span>);

		<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">DeliveryToken</span>::<span class="ident">from_message</span>(<span class="ident">msg</span>));
		<span class="kw">let</span> <span class="ident">tokcb</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">clone</span>();

		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">copts</span> <span class="op">=</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_responseOptions</span>::<span class="ident">default</span>();
		<span class="ident">copts</span>.<span class="ident">onSuccess</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_success</span>);
		<span class="ident">copts</span>.<span class="ident">context</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">into_raw</span>(<span class="ident">tokcb</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
			<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">msg</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap</span>();
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_sendMessage</span>(<span class="self">self</span>.<span class="ident">handle</span>, <span class="ident">msg</span>.<span class="ident">topic</span>.<span class="ident">as_ptr</span>(), <span class="kw-2">&amp;</span><span class="ident">msg</span>.<span class="ident">cmsg</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">copts</span>)
		};

		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">copts</span>.<span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>) };
			<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">from_error</span>(<span class="ident">rc</span>))
		}
		<span class="kw">else</span> {
			<span class="ident">tok</span>.<span class="ident">set_msgid</span>(<span class="ident">copts</span>.<span class="ident">token</span> <span class="kw">as</span> <span class="ident">i16</span>);
			<span class="ident">tok</span>
		}
	}

	<span class="doccomment">/// Subscribes to a single topic.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `topic` The topic name</span>
	<span class="doccomment">/// `qos` The quality of service requested for messages</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">subscribe</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">topic</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">qos</span>: <span class="ident">i32</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span> {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Subscribe to &#39;{}&#39; @ QOS {}&quot;</span>, <span class="ident">topic</span>, <span class="ident">qos</span>);

		<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">DeliveryToken</span>::<span class="ident">new</span>());
		<span class="kw">let</span> <span class="ident">tokcb</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">clone</span>();

		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">copts</span> <span class="op">=</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_responseOptions</span>::<span class="ident">default</span>();
		<span class="ident">copts</span>.<span class="ident">onSuccess</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_success</span>);
		<span class="ident">copts</span>.<span class="ident">context</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">into_raw</span>(<span class="ident">tokcb</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

		<span class="kw">let</span> <span class="ident">topic</span> <span class="op">=</span> <span class="ident">CString</span>::<span class="ident">new</span>(<span class="ident">topic</span>).<span class="ident">unwrap</span>();

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_subscribe</span>(<span class="self">self</span>.<span class="ident">handle</span>, <span class="ident">topic</span>.<span class="ident">as_ptr</span>(), <span class="ident">qos</span>, <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">copts</span>)
		};

		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">copts</span>.<span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>) };
			<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">from_error</span>(<span class="ident">rc</span>))
		}
		<span class="kw">else</span> { <span class="ident">tok</span> }
	}

	<span class="doccomment">/// Subscribes to multiple topics simultaneously.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `topic` The topic name</span>
	<span class="doccomment">/// `qos` The quality of service requested for messages</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">subscribe_many</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">topic</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>, <span class="kw-2">mut</span> <span class="ident">qos</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span> {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Subscribe to &#39;{:?}&#39; @ QOS {:?}&quot;</span>, <span class="ident">topic</span>, <span class="ident">qos</span>);

		<span class="comment">// TOOD: Make sure topic &amp; qos are same length (or use min)</span>
		<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">DeliveryToken</span>::<span class="ident">new</span>());
		<span class="kw">let</span> <span class="ident">tokcb</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">clone</span>();

		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">copts</span> <span class="op">=</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_responseOptions</span>::<span class="ident">default</span>();
		<span class="ident">copts</span>.<span class="ident">onSuccess</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_success</span>);
		<span class="ident">copts</span>.<span class="ident">context</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">into_raw</span>(<span class="ident">tokcb</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

		<span class="kw">let</span> <span class="ident">topic</span> <span class="op">=</span> <span class="ident">StringCollection</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="ident">topic</span>);

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_subscribeMany</span>(<span class="self">self</span>.<span class="ident">handle</span>, <span class="ident">topic</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">c_int</span>,
										 <span class="ident">topic</span>.<span class="ident">as_c_arr_ptr</span>(), <span class="ident">qos</span>.<span class="ident">as_mut_ptr</span>(), <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">copts</span>)
		};

		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">copts</span>.<span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>) };
			<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">from_error</span>(<span class="ident">rc</span>))
		}
		<span class="kw">else</span> { <span class="ident">tok</span> }
	}

	<span class="doccomment">/// Unsubscribes from a single topic.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `topic` The topic to unsubscribe. It must match a topic from a</span>
	<span class="doccomment">/// 		previous subscribe.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unsubscribe</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">topic</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span> {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Unsubscribe from &#39;{}&#39;&quot;</span>, <span class="ident">topic</span>);

		<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">DeliveryToken</span>::<span class="ident">new</span>());
		<span class="kw">let</span> <span class="ident">tokcb</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">clone</span>();

		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">copts</span> <span class="op">=</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_responseOptions</span>::<span class="ident">default</span>();
		<span class="ident">copts</span>.<span class="ident">onSuccess</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_success</span>);
		<span class="ident">copts</span>.<span class="ident">context</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">into_raw</span>(<span class="ident">tokcb</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

		<span class="kw">let</span> <span class="ident">topic</span> <span class="op">=</span> <span class="ident">CString</span>::<span class="ident">new</span>(<span class="ident">topic</span>).<span class="ident">unwrap</span>();

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_unsubscribe</span>(<span class="self">self</span>.<span class="ident">handle</span>, <span class="ident">topic</span>.<span class="ident">as_ptr</span>(), <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">copts</span>)
		};

		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">copts</span>.<span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>) };
			<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">from_error</span>(<span class="ident">rc</span>))
		}
		<span class="kw">else</span> { <span class="ident">tok</span> }
	}

	<span class="doccomment">/// Unsubscribes from multiple topics simultaneously.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `topic` The topics to unsubscribe. Each must match a topic from a</span>
	<span class="doccomment">/// 		previous subscribe.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unsubscribe_many</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">topic</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Token</span><span class="op">&gt;</span> {
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Unsubscribe from &#39;{:?}&#39;&quot;</span>, <span class="ident">topic</span>);

		<span class="kw">let</span> <span class="ident">tok</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">DeliveryToken</span>::<span class="ident">new</span>());
		<span class="kw">let</span> <span class="ident">tokcb</span> <span class="op">=</span> <span class="ident">tok</span>.<span class="ident">clone</span>();

		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">copts</span> <span class="op">=</span> <span class="ident">ffi</span>::<span class="ident">MQTTAsync_responseOptions</span>::<span class="ident">default</span>();
		<span class="ident">copts</span>.<span class="ident">onSuccess</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Token</span>::<span class="ident">on_success</span>);
		<span class="ident">copts</span>.<span class="ident">context</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">into_raw</span>(<span class="ident">tokcb</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>;

		<span class="kw">let</span> <span class="ident">topic</span> <span class="op">=</span> <span class="ident">StringCollection</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="ident">topic</span>);

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_unsubscribeMany</span>(<span class="self">self</span>.<span class="ident">handle</span>, <span class="ident">topic</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">c_int</span>,
										   <span class="ident">topic</span>.<span class="ident">as_c_arr_ptr</span>(), <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">copts</span>)
		};

		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> {
			<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">Arc</span>::<span class="ident">from_raw</span>(<span class="ident">copts</span>.<span class="ident">context</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Token</span>) };
			<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Token</span>::<span class="ident">from_error</span>(<span class="ident">rc</span>))
		}
		<span class="kw">else</span> { <span class="ident">tok</span> }
	}

	<span class="doccomment">/// Start consuming incoming messages.</span>
	<span class="doccomment">/// This initializes the client to receive messages into an internal</span>
	<span class="doccomment">/// queue which can be read synchronously.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">start_consuming</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Receiver</span><span class="op">&lt;</span><span class="ident">Message</span><span class="op">&gt;</span> {
		<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>): (<span class="ident">Sender</span><span class="op">&lt;</span><span class="ident">Message</span><span class="op">&gt;</span>, <span class="ident">Receiver</span><span class="op">&lt;</span><span class="ident">Message</span><span class="op">&gt;</span>) <span class="op">=</span> <span class="ident">mpsc</span>::<span class="ident">channel</span>();

		<span class="self">self</span>.<span class="ident">set_message_callback</span>(<span class="kw">move</span> <span class="op">|</span>_,<span class="ident">msg</span><span class="op">|</span> {
			<span class="ident">tx</span>.<span class="ident">send</span>(<span class="ident">msg</span>).<span class="ident">unwrap</span>();
		});

		<span class="ident">rx</span>
	}

	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stop_consuming</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {
		<span class="macro">unimplemented</span><span class="macro">!</span>();
	}
}

<span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">AsyncClient</span> {
	<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
		<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">persistence_ptr</span>.<span class="ident">is_null</span>() {
			<span class="kw">unsafe</span> {
				<span class="ident">drop</span>(<span class="ident">Box</span>::<span class="ident">from_raw</span>(<span class="self">self</span>.<span class="ident">persistence_ptr</span>));
			}
		}
	}
}

<span class="comment">/////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">//								Builder</span>
<span class="comment">/////////////////////////////////////////////////////////////////////////////</span>

<span class="doccomment">/// Builder to collect the MQTT asynchronous client creation options.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AsyncClientBuilder</span>
{
	<span class="ident">copts</span>: <span class="ident">ffi</span>::<span class="ident">MQTTAsync_createOptions</span>,
	<span class="ident">server_uri</span>: <span class="ident">String</span>,
	<span class="ident">client_id</span>: <span class="ident">String</span>,
	<span class="ident">persistence_type</span>: <span class="ident">i32</span>,	<span class="comment">// TODO: Make this an enumeration</span>
}

<span class="kw">impl</span> <span class="ident">AsyncClientBuilder</span> {
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">AsyncClientBuilder</span> {
		<span class="ident">AsyncClientBuilder</span> {
			<span class="ident">copts</span>: <span class="ident">ffi</span>::<span class="ident">MQTTAsync_createOptions</span>::<span class="ident">default</span>(),
			<span class="ident">server_uri</span>: <span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>(),
			<span class="ident">client_id</span>: <span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>(),
			<span class="ident">persistence_type</span>: <span class="number">0</span>,		<span class="comment">// 0 = Default file persistence</span>
		}
	}

	<span class="doccomment">/// Sets the address for the MQTT broker/server.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `server_uri` The address of the MQTT broker. It takes the form</span>
	<span class="doccomment">/// 			 &lt;i&gt;protocol://host:port&lt;/i&gt;, where &lt;i&gt;protocol&lt;/i&gt; must</span>
	<span class="doccomment">/// 			 be &lt;i&gt;tcp&lt;/i&gt; or &lt;i&gt;ssl&lt;/i&gt;. For &lt;i&gt;host&lt;/i&gt;, you can</span>
	<span class="doccomment">/// 			 specify either an IP address or a host name. For instance,</span>
	<span class="doccomment">/// 			 to connect to a server running on the local machines with</span>
	<span class="doccomment">/// 			 the default MQTT port, specify &lt;i&gt;tcp://localhost:1883&lt;/i&gt;.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">server_uri</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">server_uri</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">AsyncClientBuilder</span> {
		<span class="self">self</span>.<span class="ident">server_uri</span> <span class="op">=</span> <span class="ident">server_uri</span>.<span class="ident">to_string</span>();
		<span class="self">self</span>
	}

	<span class="doccomment">/// Sets the client identifier for connection to the broker.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `client_id` A unique identifier string to be passed to the broker</span>
	<span class="doccomment">/// 			when the connection is made. This must be a UTF-8 encoded</span>
	<span class="doccomment">///				string. If it is empty, the broker will create and assign</span>
	<span class="doccomment">///				a unique name for the client.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">client_id</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">client_id</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">AsyncClientBuilder</span> {
		<span class="self">self</span>.<span class="ident">client_id</span> <span class="op">=</span> <span class="ident">client_id</span>.<span class="ident">to_string</span>();
		<span class="self">self</span>
	}

	<span class="doccomment">/// Turns default file persistence on or off.</span>
	<span class="doccomment">/// When turned on, the client will use the default, file-based,</span>
	<span class="doccomment">/// persistence mechanism. This stores information about in-flight</span>
	<span class="doccomment">/// messages in persistent storage on the file system, and provides</span>
	<span class="doccomment">/// some protection against message loss in the case of unexpected</span>
	<span class="doccomment">/// failure.</span>
	<span class="doccomment">/// When turned off, the client uses in-memory persistence. If the</span>
	<span class="doccomment">/// client crashes or system power fails, the client could lose</span>
	<span class="doccomment">/// messages.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `on` Whether to turn on file-based message persistence.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">persistence</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">on</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">AsyncClientBuilder</span> {
		<span class="comment">// 0=file persistence, 1=persistence off</span>
		<span class="self">self</span>.<span class="ident">persistence_type</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">on</span> { <span class="number">0</span> } <span class="kw">else</span> { <span class="number">1</span> };
		<span class="self">self</span>
	}

	<span class="comment">// TODO:</span>
	<span class="comment">// This will allow the app to specify a user-defined persistence mechanism</span>
<span class="comment">//	pub fn user_persistence&lt;T: UserPersistence&gt;(&amp;mut self, persistence: T)</span>
<span class="comment">//				-&gt; &amp;mut AsyncClientBuilder {</span>
<span class="comment">//		// Setup the user persistence</span>
<span class="comment">//	}</span>

	<span class="doccomment">/// Enables or disables off-line buffering of out-going messages when</span>
	<span class="doccomment">/// the client is disconnected.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `on` Whether or not the application is allowed to publish messages</span>
	<span class="doccomment">///		 if the client is off-line.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">offline_buffering</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">on</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">AsyncClientBuilder</span> {
		<span class="self">self</span>.<span class="ident">copts</span>.<span class="ident">sendWhileDisconnected</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">on</span> { <span class="number">1</span> } <span class="kw">else</span> { <span class="number">0</span> };
		<span class="self">self</span>
	}

	<span class="doccomment">/// Enables off-line buffering of out-going messages when the client is</span>
	<span class="doccomment">/// disconnected and sets the maximum number of messages that can be</span>
	<span class="doccomment">/// buffered.</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// # Arguments</span>
	<span class="doccomment">///</span>
	<span class="doccomment">/// `max_buffered_msgs` The maximum number of messages that the client</span>
	<span class="doccomment">///						will buffer while off-line.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max_buffered_messages</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">max_buffered_messages</span>: <span class="ident">i32</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">AsyncClientBuilder</span> {
		<span class="self">self</span>.<span class="ident">copts</span>.<span class="ident">sendWhileDisconnected</span> <span class="op">=</span> <span class="number">1</span>;	<span class="comment">// Turn it on</span>
		<span class="self">self</span>.<span class="ident">copts</span>.<span class="ident">maxBufferedMessages</span> <span class="op">=</span> <span class="ident">max_buffered_messages</span>;
		<span class="self">self</span>
	}

	<span class="doccomment">/// Finalize the builder and create an asynchronous client.</span>
	<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">finalize</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">AsyncClient</span> {
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cli</span> <span class="op">=</span> <span class="ident">AsyncClient</span> {
			<span class="ident">handle</span>: <span class="ident">ptr</span>::<span class="ident">null_mut</span>(),
			<span class="ident">opts</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">ConnectOptions</span>::<span class="ident">new</span>()),
			<span class="ident">callback_context</span>: <span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="ident">CallbackContext</span> {
				<span class="ident">on_connection_lost</span>: <span class="prelude-val">None</span>,
				<span class="ident">on_message_arrived</span>: <span class="prelude-val">None</span>,
			}),
			<span class="ident">server_uri</span>: <span class="ident">CString</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">server_uri</span>.<span class="ident">clone</span>()).<span class="ident">unwrap</span>(),
			<span class="ident">client_id</span>: <span class="ident">CString</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">client_id</span>.<span class="ident">clone</span>()).<span class="ident">unwrap</span>(),
			<span class="ident">persistence_ptr</span>: <span class="ident">ptr</span>::<span class="ident">null_mut</span>(),
		};

		<span class="comment">// TODO We wouldn&#39;t need this if C options were immutable in call</span>
		<span class="comment">// to ffi:MQTTAsync:createWithOptions</span>
		<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">copts</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">copts</span>.<span class="ident">clone</span>();

		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;Create opts: {:?}&quot;</span>, <span class="ident">copts</span>);

		<span class="kw">let</span> <span class="ident">rc</span> <span class="op">=</span> <span class="kw">unsafe</span> {
			<span class="ident">ffi</span>::<span class="ident">MQTTAsync_createWithOptions</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">cli</span>.<span class="ident">handle</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">c_void</span>,
											 <span class="ident">cli</span>.<span class="ident">server_uri</span>.<span class="ident">as_ptr</span>(),
											 <span class="ident">cli</span>.<span class="ident">client_id</span>.<span class="ident">as_ptr</span>(),
											 <span class="self">self</span>.<span class="ident">persistence_type</span>, <span class="ident">ptr</span>::<span class="ident">null_mut</span>(),
											 <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">copts</span>)
		};

		<span class="kw">if</span> <span class="ident">rc</span> <span class="op">!=</span> <span class="number">0</span> { <span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;Create failure: {}&quot;</span>, <span class="ident">rc</span>); }
		<span class="macro">debug</span><span class="macro">!</span>(<span class="string">&quot;AsyncClient handle: {:?}&quot;</span>, <span class="ident">cli</span>.<span class="ident">handle</span>);

		<span class="comment">// TODO: This can fail. We should return a Result&lt;AsyncClient&gt;</span>
		<span class="ident">cli</span>
	}
}

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